Absorption of sulfur dioxide in citric acid-sodium citrate buffer solutions

1987 ◽  
Vol 26 (7) ◽  
pp. 1291-1296 ◽  
Author(s):  
Binay K. Dutta ◽  
Ranjan K. Basu ◽  
Amit Pandit ◽  
Parthasarathi Ray
Keyword(s):  
Citric Acid ◽  
Sulfur Dioxide ◽  
Sodium Citrate ◽  
Citrate Buffer ◽  
Buffer Solutions ◽  
Sodium Citrate Buffer

Fracturing and adhesion behavior of hydroxyapatite formed by a citric acid and sodium citrate buffer system

2016 ◽  
Vol 58 (2) ◽  
pp. 140-145 ◽  
Author(s):  
İbrahim Aydin ◽  
Hakan Çetinel ◽  
Ahmet Pasinli ◽  
Mithat Yuksel
Keyword(s):  
Citric Acid ◽  
Sodium Citrate ◽  
Buffer System ◽  
Citrate Buffer ◽  
Adhesion Behavior ◽  
Sodium Citrate Buffer

Preparation of Hydroxyapatite Coating by Using Citric Acid Sodium Citrate Buffer System in the Biomimetic Procedure

2013 ◽  
Vol 55 (10) ◽  
pp. 782-788 ◽  
Author(s):  
Ibrahim Aydin ◽  
Hakan Cetinel ◽  
Ahmet Pasinli ◽  
Mithat Yuksel
Keyword(s):  
Citric Acid ◽  
Sodium Citrate ◽  
Hydroxyapatite Coating ◽  
Buffer System ◽  
Citrate Buffer ◽  
Sodium Citrate Buffer

Sodium citrate buffer

2009 ◽  
Vol 2009 (12) ◽  
pp. pdb.rec12040-pdb.rec12040
Keyword(s):  
Sodium Citrate ◽  
Citrate Buffer ◽  
Sodium Citrate Buffer

Studies of the chemoenzymatic modification of cellulosic pulps by the laccase-TEMPO system

Holzforschung ◽  
2011 ◽  
Vol 65 (4) ◽  
Author(s):  
Ilabahen Patel ◽  
Roland Ludwig ◽  
Dietmar Haltrich ◽  
Thomas Rosenau ◽  
Antje Potthast
Keyword(s):  
Sodium Citrate ◽  
Similar Reaction ◽  
Carbonyl Groups ◽  
Citrate Buffer ◽  
Hydroxymethyl Group ◽  
Mediator System ◽  
Sodium Citrate Buffer ◽  
Reaction Proceeds ◽  
Aldehyde Groups ◽  
Aqueous Conditions

Abstract The chemoenzymatic modification of cellulosic pulps by the laccase-mediator system (LMS) consisting of laccase (EC 1.10.3.2) and the 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) has been investigated. The reaction proceeds under mild aqueous conditions (sodium citrate buffer pH 6, 30°C) and introduces primarily aldehyde groups into cellulose so that carboxyl groups amount to one-third to one-fifth of the carbonyl groups only. LMS treatment caused uniform oxidation of the material, also in the high-molecular weight area, which is a non-typical behavior compared to other chemical oxidations of cellulose. Treatment of the pulp only with TEMPO or only with laccase caused no changes whatsoever, whereas treatment with the TEMPO-derived oxoammonium ion (in the absence of laccase) introduced carbonyl groups into the pulp, but no carboxyls. This chemoenzymatic approach was compared to the well-known chemical approach by means of TEMPO and hypohalite. Both approaches yielded comparable distributions of functional groups at the low oxidation degrees studied, indicating a similar reaction mechanism with the TEMPO-derived oxoammonium ion being the actual oxidant. The laccase is able to generate this oxoammonium ion, which in turn oxidized the 6-hydroxymethyl group into the corresponding aldehyde.

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